Backup Job failed : User cancelled a physical volume

All,

Our backup job was cancelled and the error message " User cancelled a physical volume".

We thought that the tape getting full and needs more space. So we removed some backup directories to increase space for the tape.

The next day job completed successfully. But after that succesfull completion, the next day job failed.

The Backup job failed even after reducing the size.

Please see the attachment

Many Thanks

ragatry